Aug 6, 2007
A very unstable airmass remained in place across Iowa on the evening of the 6th with an east-west boundary lying across the mid section of the state. CAPE rose to around 4000 J/kg by late afternoon as afternoon highs reached the upper 80s to low 90s, and dew point temperatures were in the mid 70s to low 80s. The freezing level was very high, between 16,000 and 16,500 feet, reducing the threat of hail even though the CAPE in the hail layer, -10 to -30 C. layer, was in the 500 to 700 J/kg range.
Source: NOAA National Weather Service Storm Events Database (event 38428). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Audubon County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.